CS6 upgraded to CC, acrobat now asks for snr... i entered and it seems to work. However, i noticed that CS6 disappeared from my registered products. Re-registration failed because the snare is already used. Will CC keep on working, and not ask me for the CS6 serial number in the middle of a job ?
Sounds like your CS6 perpetual license was reassigned to your CC subscription, and it will continue to work as long as you pay the subscription fees. If you decide to stop and want to go back to the perpetual license for CS6 you'll probably have to jump through a few hoops to uninstall, log onto Adobe.com using a different Adobe ID, and reinstall CS6 from your original disks/downloads.